javaScript中的变量和函数

妖狐艹你老母 2023-07-17 06:17 12阅读 0赞

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<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>javaScript中的变量和函数</title>
    </head>
    <body>
    <h1>javaScript中的变量和函数</h1>
    </body>
    <script type="text/javascript">
    //js中可以定义同名的变量而不会报错
    	var f = 66; //变量名叫f
    	console.log(f);
    	var f = 77; //变量名也叫f
    	console.log(f);
    	f = 88;
    	console.log(f);
    	//js中变量名区分大小写
    	var F = 12;
    	console.log(F);
    
    	test();
    	//js中函数名区分大小写
    	function test() {
    		console.log('我是test()函数');
    	}
    
    	TEST();
    	function TEST() {
    		console.log('我是TEST()函数');
    	}
    	
    	fn66();
    	function fn66(){
    		console.log('我是fn66()函数.....1');
    	}
    	//如果函数重名/同名，则后面的函数会覆盖前面的函数
    	function fn66(){
    		console.log('我是fn66()函数.....2');
    	}
    
    	console.log(document, '****1');
    	console.log(Document, '****2');
    	
    	var fn = function() {
    		console.log('我是匿名函数');
    	}
    	
    	console.log(fn, '案例1');
    	console.log(function() {console.log('hi,我是匿名函数....');}, '案例2');
    	console.log(function() {console.log('hello,我是匿名函数');}(), '案例3');
    	console.log(function() {return 55;}, '案例4');
    	console.log(function() {return 33;}(), '案例5');
    </script>
    </html>

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